selenium mining process

Selenium solutions for mining, power plants, oil refining

Microbes will only use selenate/selenite as electron acceptors if alternative, more preferred electron acceptors such as oxygen and nitrate are not present, so the process must take place under anoxic conditions and after denitrification. Learn more about EOSi's experience with biological treatment of selenium in the mining...

Coal mining and selenium - Werner Antweiler

Feb 7, 2015 ... This Q+A explains some of the issues related to selenium and coal mining. Map of Teck mines in the Elk Valley. What is selenium? Selenium is a naturally occurring element (chemical symbol: Se). Coal is a major geologic source of selenium. Natural processes distribute selenium and transform it into...

Methods for Removing Selenium from Aqueous Systems - InfoMine

Nov 6, 2011 ... Selenium is among the list of oxyanions that lead to contamination in mining aqueous waste streams. Though the elemental forms are toxic, the aqueous oxyanions are more so. The most common forms of selenium released during mining processes are the aqueous forms, selenite and selenates.

Minerals | Free Full-Text | Mining-Related Selenium Contamination ...

Mar 21, 2017 ... Selenium release and pollution is a worldwide phenomenon that results from a wide variety of anthropogenic activities, such as agriculture, mining, and other process industries. Selenium is a potentially toxic element, and mining-related selenium release was a major concern during the last decade as high...

Selenium - Wikipedia

Selenium is a chemical element with symbol Se and atomic number 34. It is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. It rarely occurs in its elemental state or as pure ore compounds in the Earth's...

Selenium | Minerals Education Coalition

Selenium minerals are rare, and although selenium-rich ores exist, few are mined exclusively for the element. Most selenium is obtained as a by-product of copper ore processing. Selenium occasionally is found in pure form. It occurs in the rare minerals clausthalite and crooksite. Despite the name, the mineral selenite...

Selenium Removal : BQE Water

Growing awareness of the environmental impact of selenium has resulted in selenium removal becoming an important issue for mining operations. ... We offer a process that combines ion exchange and electrochemical reduction to selectively remove selenium from mining wastewater down to single-digit ppb levels. More...

Linking Selenium Sources to Ecosystems - Mining - USGS

Jun 9, 2010 ... Waste leachate selenium concentrations have been found to be related to the overall magnitude of the selenium reservoir available for release over time. Additionally, alkaline conditions (in surrounding strata and aquifers or introduced) can neutralize traditional acid mine drainage and in the process...

Treatment of Coal Mining Selenium Wastes - Envirogen Technologies

these requirements. Treatment of selenium in coal mining wastewaters presents a series of challenges. It can be present in relatively dilute concentrations and in streams with variable and often high flow rates. It is present in many soluble and particulate forms, which may affect process design and treatability. The conditions...

Selenium Removal Technologies A Review - Water Online

Jan 15, 2016 ... In southeastern Idaho phosphate mines, selenium has been a major issue for two decades and is currently the subject of a large-scale federally mandated cleanup effort. In British Columbia's Elk River Valley coal mining operations, Teck Resources Ltd. is actively searching for methods to control and treat...

Simultaneous selenate reduction and denitrification by a consortium ...

May 25, 2017 ... Removal of selenium from mine influenced water is complicated by the presence of nitrate, which is also elevated in mine influenced water due to the use of explosives in mining. In many biological treatment processes, nitrate as a thermodynamically more preferable electron acceptor inhibits selenate...

Selenium | chemical element | Britannica.com

In 1817 Swedish chemist Jöns Jacob Berzelius noted a red substance resulting from sulfide ores from mines of Falun, Sweden. When this red material was investigated in the following year, it proved to be an element and was named after the Moon or the Moon goddess Selene. An ore of unusually high selenium content...

Methods for removing selenium from aqueous systems - UBC ...

Oct 7, 2011 ... The most common forms of selenium released during mining processes are the aqueous forms, selenite and selenates. The common treatment technologies to date can be summed up in these major categories: media filtration, chemical treatment, and biomediated removal. These methods can often...

Aquatic Hazard of Selenium Pollution From Mountaintop Removal ...

Selenium is a naturally occurring chemical element in coal that can be released during the mining process and find its way into nearby aquatic habitats. Selenium in raw coal and overburden is leached out when these materials are exposed to air and water, and the leachate can pose a significant environmental hazard...

Selenium: Contrary Stuff | ETF.com

Feb 22, 2010 ... All selenium is produced as a byproduct of the mining and processing of a couple of base metals. Some 90 percent comes from copper ores, while lead ores make up most of the remaining 10 percent. (A negligible amount is also derived from the processing of nickel.) Selenium and tellurium, however, are...

Appeals Court Upholds Ruling that Xinhaiia Mines are Liable For ...

Jul 11, 2014 ... The ruling sets a precedent that coal mines in Xinhaiia which produce selenium pollution will be held accountable unless they explicitly disclose the potential for discharges of that pollution to the state as part of the permit application process. The ruling upholds an earlier district court opinion in favor of a...

Frontier Water Systems | Selenium, Nitrate and Metals Treatment

Koocanusa Concentrations Exceed New Selenium Standard ...

Jul 19, 2016 ... On Lake Koocanusa, scientists and researchers from a multitude of agencies are in the process of developing a site-specific plan as they continue to monitor the influx of selenium leaching out of upstream Canadian coal mines located on the Elk River, which rushes into the Kootenay River and converges...

Mines blamed for high selenium levels in B.C.'s Elk River | CBC News

Jul 26, 2013 ... A U.S. study has linked coal mining in the Elk River in southeast British Columbia to high levels of selenium, and that has prompted the B.C. government to ... As part of the program Teck has hired Vancouver-based environmental company BioteQ to pilot a new selenium removal process at its coal mines.

Solving the selenium problem

Nov 4, 2016 ... The ABMet process has been deployed at mine and coal power generation sites. Courtesy of GE Water. Between 1974 and 1984 something caused severe deformities in the fish and wiped out 19 of Belews Lake's 20 species at alarming rates in North Carolina. The scenic manmade lake in the foothills of...

microbial and cell-free selenium bioreduction in mining ... - INOTEC

Mar 13, 1997 ... INTRODUCTION. This chapter discusses factors important for removal and recovery of selenium from mining waste and process waters. Selenium reduction is presented as an example of microbial metal/metalloid reduction with potential application to the treatment of high-volume wastewaters. Mining and...

A Procedure for NEPA Assessment of Selenium Hazards Associated ...

Jan 18, 2007 ... This paper gives step-by-step instructions for assessing aquatic selenium hazards associated with mining. The procedure was developed to provide the U.S. Forest Service with a proactive capability for.

New hybrid electrocoagulation membrane process for removing ...

Nov 30, 2006 ... The residual selenium concentration, the large sludge quantities generated as well as the expense of reagents are just some of the shortcomings of this technology. To combat these problems, a new hybrid process combining electrocoagulation and microfiltration was drawn up and verified in experiments.

Selenium and molybdenum enrichment in uranium roll-front ...

South eastern Wyoming samples were taken from core cuttings (part of active projects), and Colorado samples were collected at the surface (no exploration or mining activity). The anatomies of roll-fronts in Colorado and Wyoming exhibit a number of redox zones in cross section, including oxidized-altered sandstone, redox...

N-P Fertilization Stimulates Anaerobic Selenium Reduction in an ...

We decided that any effects of the manipulation in the manipulated lake would be clearly identifiable and possible to separate from natural variability. Hence, the upstream lake is not included in the analysis and data is not shown in this document. Both lakes are abandoned surface mine pits that were...

Selenium in our water: Wildsight calls for halt to new mines in the Elk ...

Jan 30, 2017 ... Despite more than three years of operations at West Line Creek, Teck's treatment process has still not safely solved the selenium problem from that mine. Selenium-leaching waste rock dumps at all five of Teck's Elk Valley mines continue to grow – and selenium levels in the Elk River and downstream...

Water Quality in the Elk Valley - Teck

The mining process generates large quantities of leftover rock that contains naturally-occurring substances such as selenium, an element that is essential for human and animal health in small amounts. Water from both precipitation and runoff flows through these rock piles and carries selenium and other substances, such...

Health Impacts of Selenium Related to Phosphorous Mining

As is true with all substances, the dosage determines the difference between nutrient and poison. In order to understand the impacts of phosphorous mining, a basic understanding of what phosphorous is and why it is mined is first needed.

Smoky Canyon Mine Site Investigation Report

For the Smoky. Canyon Mine Site where the majority of selenium is present as selenate, chemical or biological reduction from selenate to selenite would need to be an integral part of the treatment system. However, due to the shortcomings of selenite precipitation as a key treatment process, it will not be discussed further. -1.

SeleniumZero - Veolia

SeleniumZero® is a cost-effective process that utilizes a proprietary Hydrex® adsorption media to remove selenium from mine water. In response to new regulations affecting the Mining industry, Veolia Water Technologies has developed a process using a patented iron oxide-based media in conjunction with filtration for.

Mountaintop mining poisons fish -- ScienceDaily

Mar 1, 2010 ... "We're killing fish right now with selenium pollution from mountaintop removal mining," says Lemly. Toxic levels of selenium were found in 73 of 78 stream samples. The threat is expanding as use of this destructive process expands. Once these ecosystems are polluted, damage to the environment is...

How to use the world's scarce selenium resources efficiently to ...

On these bases we have proposed adding selenium-enriched, sprouted cereal grain during food processing as an efficient way to introduce this nutrient into deficient diets. Selenium is a non-renewable resource. There is now an enormous wastage of selenium associated with large-scale mining and industrial processing.

Environmental Selenium Research: From Microscopic Processes to ...

Nov 30, 2011 ... Environmental Selenium Research: From Microscopic Processes to Global Understanding ... The recent development of analytical techniques and methods enables accurate selenium measurements of environmental concentrations, which will lead to a better ..... ES2-5 isolated from a selenium mining soil.

Ecological Impacts of Mountaintop Removal – Appalachian Voices

As a result, water downstream of mountaintop removal mines has significantly higher levels of sulfate and selenium, and increases in electrical conductivity, a measure ... Contrasting photos of a typical mountain stream (by Christi Root) and a mountain stream diverted and polluted by mining debris in a process known as a...

Selenium and Tellurium.pmd - Indian Bureau of Mines

Selenium and tellurium metals are recovered as by-products during copper, lead-zinc, gold and platinum ore processing. The principal sources of selenium are sulphide deposits and anode mud or slime obtained during electrolytic refining of copper. Tellurium is found mostly in tellurides associated with metals, such as,.

Mine Reclamation, Disequilibrium, and Selenium Contamination ...

Mar 28, 2011 ... Typically during phosphate mining, minerals containing the reduced form of selenium, selenite, are brought to the surface where they react with water and oxygen to form oxidized selenium in a process similar to sulfide weathering, which causes acid mine drainage around coal and sulfide metallic mines.